Browsing Scholarly literature by Subject "ferromanganese nodules"
Now showing items 1-20 of 96
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60 Myr records of major elements and Pb-Nd isotopes from hydrogenous ferromanganese crusts: Reconstruction of seawater paleochemistry
(Pergamon, 1999)The time series of major element geochemical and Pb- and Ni-isotopic composition obtained for seven hydrogenous ferromanganese crusts from the Atlantic, Indian, and Pacific Oceans which cover the last 60 Myr are compared. ... -
A new design concept for nodule mining system
(Publ. and Inf. Dir., New Delhi, India, 1994)An overview is presented on the hazards associated with various types of equipment to be used for the commercial mining of nodules from the seabed. The design of a suitable mining collector and the various options available ... -
Abyssal benthos of the Central Indian Ocean
(Elsevier, 1982)Quantitative studies of the abyssal benthos (3600 to 5300 m) of the central Indian Ocean show a rich fauna and high standing crops. Density of 3 meiofaunal and 12 macrofaunal taxa are large (2175 to 15233; chi = 6441 m-2). ... -
Alterations in geochemical associations in artificially disturbed deep-sea sediments
(Taylor and Francis, 2005)In view of the role of sediment geochemistry in regulating the benthic ecosystem, diagenetic remobilization of dissolved constituents, bottom water redox, and regeneration of benthic fluxes, surficial sediments in and ... -
An interactive program for digitization of seabed photographs
(CSIR-NISCAIR, 1989)A program for dignitization of seabed photographs to compute coverage and abundance of polymetallic nodules is developed. Since the objects in the seabed photograph are partially covered by thin sediment layer, the automatic ... -
Assessing the distribution and abundance of seabed minerals from seafloor photographic data in the Central Indian Ocean Basin
(Taylor & Francis, 2013)Distribution characteristics of deep-sea mineral resources such as polymetallic nodules and ferromanganese crusts are often influenced by local seafloor features such as the topographic undulations and sediment thickness. ... -
Atypical ferromanganese micronodules from middle fan-valley system, Bay of Bengal
(Current Science Association, 1994)Ferromanganese micronodules having botryoidal and spheroidal morphogroups have been observed over a 0.22 million km@u2@@ area from the middle fan region of the Bay of Bengal. The bulk micronodules have 26.26% Mn, 1.02% Fe, ... -
Australasian microtektites in a substrate: A new constraint on ferromanganese crust accumulation rates
(Elsevier, 1994)Microtektites belonging to the Australasian tektite strewn field are found in the substrate of a ferromanganese crust dredged from the Central Indian Basin. They are identified on their physical appearance, geographic ... -
Bacterial response to contrasting geochemistry in the sediments of central Indian Ocean basin
(Regional Research laboratory, Bhubaneswar, 2005)The latitudinal differences in geochemical and physiographic nature could evoke varied biological/microbiological response in the deep-sea benthic ecosystem of the Central Indian Ocean. Sediment cores have been examined ... -
Behavior of rare earth elements in coexisting manganese macronodules, micronodules, and sediments from the central Indian Basin
(Taylor and Francis, 1994)Associated manganese macronodules, micronodules, and sediments from the Central Indian Basin (CIB) were analyzed for major, trace, and rare earth elements (REE) to understand REE carrier phases and their fractionation ... -
Benthic disturbance and impact experiments in the Central Indian Ocean Basin
(Taylor and Francis, 2000)As a part of the Environmental Impact Assessment studies for nodule mining, a long-term program has been initiated in the Central Indian Basin. Multidisciplinary studies on geological, biological, physical and chemical ... -
Benthic disturbance and monitoring experiment in the Central Indian Ocean Basin
(Int. Society of Offshore and Polar Engineering, Colorado, USA, 1997)Environmental impact assessment studies for deep-sea manganese nodule mining have been initiated in the Central indian Ocean Basin since 1995. As a part of the first phase for collecting the benthic baseline data, echosounding, ... -
Buried nodules from the central Indian Ocean basin
(Regional Research laboratory, Bhubaneswar, 2005)The occurrence of buried nodules is rare compared to surface nodule abundance in the deep sea. Surface nodules are collected with freefall grab, vanveen /peterson grabs, dredges and sediment cores whereas buried nodules ... -
Cerium anomaly variations in ferromanganese nodules and crusts from the Indian Ocean
(Elsevier, 1994)Fifty analyses of rare earth elements as well as mineralogical studies have been carried out on a suite of manganese nodules and crusts from the Central Indian Basin and the Western Indian Ocean. The aim was to identify ... -
Changes in geotechnical properties of sediments from the Central Indian Basin induced by disturbance experiment
(Taylor and Francis, 2005)During the Indian Deep-sea Environment Experiment (INDEX) conducted in the Central Indian Basin to simulate nodule mining activity, the sediments were physically disturbed, lifted from the seafloor, and then redeposited ... -
Characterizing Indian Ocean manganese nodule-bearing seafloor using multi-beam angular backscatter
(Springer, 2004)Application of quantitative angular backscatter modelling to manganese nodule-bearing areas of the Central Indian Ocean Basin (CIOB) has been initiated at NIO during the year 1998. Studies were aimed to establish the ... -
Chemistry and possible resource potential of cobalt rich ferromanganese crust from Afanasiy-Nikitin seamount in the Indian Ocean
(Geological Survey of India, 1999)Samples of ferromanganese encrustations (fe-Mn crusts) dredged from the upper flank of the Afanasiy-Nikitin seamount, above the Carbonate Compensation Depth (CCD) in the Northern Central Indian Ocean (NCIO) were analysed ... -
Classification and inter-element relationships of ferromanganese nodules from the Central Indian Ocean Basin
(1987)The chemical composition of polymetallic nodule samples from 180 locations in the Central Indian Ocean Basin based on 600 chemical analyses has been investigated. These nodules contain a Mn/Fe ratio varying from 0.96 to ... -
Coexistence of pumice and manganese nodule fields-evidence for submarine silicic volcanism in the Central Indian Basin
(Pergamon, 1993)Pumice, of various shapes and sizes, uncoated or coatEd. by ferromanganese oxides, have been recovered from deeper parts of the Central Indian Basin (CIB). The pumice field covers an area of 600,000 km sup(2), approximately ... -
Composition and origin of buried ferromanganese nodules from central Indian Ocean
(Geological Society of India, 2006)Five buried ferromanganese nodules were recovered at different depths of 167-169 cm (A), 172 174 cm (B), 228 230 cm (C), 328 330 cm (D) and 418 420 cm (E) in a 5 m sediment core from the siliceous sediment of Central Indian ...